Track three (33 minutes and 33 seconds) is basically commentary for the episode 1. It really should've been on the DVD as a secondary track. It doesn't make any sense for it to be on a separate CD. I'm guessing they wanted it to be 1st-pressing only thing, yet didn't want to stamp out two different glass masters for the DVD releases, one with and one without commentary track. Either that, or they recorded the commentaries too late, after the DVD master was created. If former, what a stupid decision! If latter, what a terrible planning!
It's a shame that regular edition buyers won't get to hear the commentary because I think it goes well with the show.